Stop mechanism.



WILLIAM H. SCHOONMAKEB, 0F MONTCIJAIR, NEW JERSEY. A

STO? MECHANISM.

' Specification of Letters Patent.

l Application filed September 9, 1809. Se1ia1.No.516,881 I To all whom-tmay concern f Be it known that I, WILLIAM H. ScHooN- MAKER, ofMontclair, county of Essex, State of New Jersey, have invented certainnew and useful Improvements in Stop Mechanisms, of which the followingis a full, clear, and exact specification, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to stop mechanisms, and comprises va mechanismparticularly adapted and intended for arrestingtheoperation of soundreproducing machines at a predetermined point.

My invention is particularly applicable to so-called graphophones and itis in connection with such an instrument that I have illustrated myinvention in the accompanyling drawings, and-will describe my inven.4

tion ofthe table is manually stopped after the sound-reproducing devicetravels to .the end of the record. The 'underlying object of myinvention is to provide an automatic means for arresting the motion ofthe table in such a way that it will not interfere 1n any manner withthe normal and usual 0peration of lthe machine. vide a movable permanentmagnet having an electro-magnet attached, the circuit of which isarrangedv so that when the sound reproducing device reaches the end ofthe record the circuit is closed, the electro-magnet energized andattracted to the metallic table bringing with 'it the permanent mag-Anet so that the field of the permanent magnet reaches to the table andthe combined force of the electro and permanent magnets stop the motionof the table. I further ar;

range the circuit so that the same is broken the instant the motion ofthe table is arrested, at which time the permanent magnet continues toact on the table and holds it against rotation. When it is desired againto start the machine the'permanent magnetis moved back manually toinactive position. 'My inventmn mvolves various other fea-l To this endI proratented oet.- s, isis'.

tures of importance, all of which willbe fully set forth hereinafterad'particularly pointed out in the claims.

My invention may be adapted to existing graphophones or it may beembodied as parts of newly constructed machines. For` this 1n somerespects immaterial and the accom- -panymg drawmgs go into these detailsnly reason its precise location .on the machine is as regards theessential features of Aorganism f and coperative relation.

In said drawings which are given as an bodying the invention: Figure 1isa dia-` gram showing in outline the rotating rechrd table and theswinging arm carrying the sound reproducing.' device and illustratingthev connectionpf my invention, and Fig. A2.

is a detached view showing inside elevation the position of themagnets'with respect to.

the table.

In these drawings'i a indicates the rotat-4 example of the preferredmannerr of emi therein; and c indicates the usual governor `by which theis controlled.

Suitably mounted on the machine at theV edge of the table, but below thesame, is a ITpermanent magnet 10, here shown as of the horseshoe type.'I his magnet is mounted to move toward and from the edge of the tablepreferably by pivots 11 carried in any suitable be'arings (not shown).To the side of the magnet y10 adjacent the table care attached twoelectro-magnets 12, the pole pieces 14 of which extend upward to a pointimmediatelyv below the level of the table a and directly adjacent to theedge thereof.

speed of rotation of the table crv This table is usually vof iron sothat the magnets may attract themselves thereto, but if it. is not ofiron, an iron band may be at; tached for this purpose.

Preferably, though not necessarily, the

magnets are held out of contact with the.

table by means of a spring latch 15,the ten-l sion of which may be.regulated by a screw 16. This spring latch prevents idle motion of themagnets, but v1s not of; suiiicient strength to restrain the magnetswhen the electro-magnet or magnets are energized.` Upon energization'ofthe electro-magnets roo they attract themselves to. the. table yandbring the permanent magnets sufiiciently near thereto asto allow theirinfluence also to be exerted. The result is that the magnets stop theaction of the table and -when the electro-magnets are deener'gized thepermanent magnets still exert their influence and stillrestrain themotion of the table.

l' llhe circuit 17 of the electro-.magnets 12 embodies in addition tothe battery 18 or other source of energy, contacts 19 and 2G andcontactsA 21 and 22. Of these contacts the Contact 19 is connected byany suitable means 28 with the governor c, While the contact 22 isconnected to move with the arm o. The contacts 19 and 20 coact with eachother and the contacts 21 and 22 coact;and vtheir arrangement is suchthat as the governor o opens under the motion `of the machine thecontact 19 is engaged with the contact 2O closing the circuit at thispoint, While the contact 22engages the contact 21 closing the circuitwhen the arm Z) has been moved across the table to the end of therecord. It desired, a push button 24 may be em ployed and connected aspart of a branch circuit 25 between the contac/s 19 and 20 and 21 and22. This push button may be located at aiiy desired point removed fromthe machine. and by it `the circuit may be closed manually before thecontacts 21 and 22 are engaged,1 so that the operation of the machinemay be stopped at will.

The operation otmy invention may be traced as follows: The machine isstarted 10 into reach and causing both magnets to become active, thusstopping the table notwithstanding the action of the spring or othermotor employed to rotate it. As the magnets move toward the table theydisengage the retaining latch 15. As the motion of the machine-stops,'the governor contracts and the contact 19 is moved away from theconta'ctv20 breakingthe circuit, so as to prevent waste of electricalenergy. When the machine is again started, it is only necessary to movethe magnets manually out of engagement with the table and intoengagement With the latch 15.

The vpush button 24 and its branch circuit 25 enables the operator. tostop the machine instantly at any point. By employing a combination ofelectro and permanent magnets Leconte in the "manner described I providea means 20 and 21 and 22 are entirely immaterial excepting with regardas to their essential. `functions, and said contacts aswell as the otherelements of my invention may be arranged in the machine in any y.mannerand 1n any position convenient so long as their proper functions are notinterfered with.

Having thus described my'invention l claim as new and desire to securelietters Patent of the United States, is:

i. The combination With a. machine hat# ing a movable magnetic member.of aj stop device for such member comprising permanentand'electro-magnets connected to each other and movable towardV and frommovable magnetic member of the machine, and means for controlling theelectromagnet. l Y

2. The combination with a machine having a movable magnetic member, ci astop device tor sai/d member comprising perma nent andelectro-magnetsconnected to' each other and both movable toward and from the saidmovable magnetic member of the machine, and means for controllingltheelectromagnet, including a device for energizing the magnet at apredetermined point in'the operation of the machine.

3. rllhe combination with a machine hav ing a movable magnetic member,of a stop device for said member comprising permanent andelectro-magnets connected to each l other and both movable toward'andfrom said movable magnetic' meml erotl the machine, and means forcontrolling'the electromagnet including a device for ctenergizing themagnet when the machine is stopped.

4;. The combination with a machine having a movable magnetic member,u ofa stop device for said member comprising permanent and electro-magnetsconnected to each other and both movable towardand troni saidl movablemagnetic member of the ma chine, and means controlling the electromagnetincluding a device for. energizing the electro-magnet at apredetermined. point in the operation of the machine whereby the machineis stopped, and for denergizing the electro-magnet upon the .stoppage ofthe machine. Y

5. The combination With a machine haw ing a movable magnetic member, ota stop device for said member comprising a permanent magnet disposedadjacent to said movable magnetic member or the machine and means forautomatically moving the said permanent magnet intoaction 'after amanent `magnetan electro-magnet adapted to move said permanent magnetinto and out of action With respect to said movable magnetic member ofthe machine, and means for controlling the electro-magnet.

7. The combination With a machine having a movable magnetic member, o astop device for said member'comprising a permanent magnetic brakeadapted to act upon said movable magnetic member and means forautomatically controllingrv the action of said permanent-magnet brakeupon said movable magnetic member, to stop the machine after apredetermined,operation.

8. The combination with a machine having a movable magnetic member, of astop device for said member comprising a perL manent magnet movable intoand out of' active position with respect to said movable magnetic memberof the machine, to arrest or release said movable magnetic member, andmeans for automatically moving said magnet after a predeterminedmovement of said movable magnetic member.

9. The combination, with a machine comprising a rotatable member, atraveling member arranged to move progressively as said rotatable memberrotates, anda centrifugal governor' operated in. accordance with therotation of said rotatable member, of motion-arresting means for saidrotatable member, comprising an electro-magnet arrangedvvhen energizedto move rictional retarding means into engagement with said rotatablemember, contact means operated y by said traveling member arranged toclose the circuit of said magnet at a predetermined point in the travelof said traveling -tWo subscribing Witnesses.

member, and contact means operated by saidfgovernor and arranged to`break the circuit of said magnet When the speed of said governor fallsbelow a predetermined minimum. i

10. The combination, with va machine comp ising a rotatable magneticmember, a traveing member arranged to move progressively as saidmagnetic member rotates,

and acentrifugal governor operated in accordance with the rotation ofsaid magnetic member, of motion-arresting means forsaid magnetic member,comprising an electro magnet movably mounted and provided Withfriction-retarding means which, when the magnet is energized, is movedby and with said magnet into frictional engagement with said magneticmember, contact means operated by said traveling member arranged toclose the circuit of," said magnet at a predetermined point in' thetravel of said traveling member, and contact means operated by saidgovernor and arranged to break the circuit of said magnet when'the speedof the governor falls below a predetermined minimum.

11. rThe combination, with a machine comprising a movable member, of anelectro-magnet movably mounted vto move, when energized, intomotion-arresting engagement With said member, and a latch, normally'holding said magnet out of engagement with said member, but adapted torelease said magnet and permit it to move into such engagement.

In testimony whereof I. have :signed my name to this specification inthe presence of Witnesses:

ISAAC B. OwnNs, B. Bison.

